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x in (-oo:+oo)
(7/2)*x-7 = 2 // - 2
(7/2)*x-7-2 = 0
7/2*x-9 = 0 // + 9
7/2*x = 9 // : 7/2
x = 9/7/2
x = 18/7
x = 18/7
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